Abstract We have compiled a new sample of galaxies with published
catalogs of HII region coordinates. This sample, together with the
former catalog of García-Gómez & Athanassoula (1991),
will form the basis for subsequent studies of the spiral structure in
disc galaxies. In this paper we address the problem of the
deprojection of the galaxy images. For this purpose we use two deprojection
methods based on the HII region distribution and compare the results
with the values found in the literature using other deprojection
methods. Taking into account the results of all the methods, we
propose optimum values for the position and inclination angles of all
the galaxies in our sample.